How Old Is My Dog?

Calculate your dog's age in human years

Happy Bithday Dog

If you ever asked yourself this question, surely you know the popular belief that puts forward that each year of life of a dog equals to 7 human years. In reality, canine life expectancy is directly linked to the dog’s size or weight.

Longevity varies according to the dog’s size or weight in their adult state, which is in turn determined by their genetic make up or breed. Size, or weight, is a determinant of the life cycle as well as longevity of a dog. For example, while most dogs reach maturity between 12 and 18 months of age, larger dog breeds reach adulthood more slowly, at 24 months. In general, the smallest dogs are the longest living, as they can live about 15 years on average, while larger dogs live between 7 and 8 years.

Dogs and cats ages in human years



The American Veterinary Medical Association has created the following table to illustrate how a dog’s age and its human equivalent varies in accordance to the dog’s weight.



Likewise, size or weight is also related to the age at which a dog becomes a senior. The age at which a dog could begin to show signs of aging could be 11, 10, 8 and 7 years for small, medium, large and giant dogs, respectively.

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The following table summarizes WebMd’s empirical data to indicate the years that dogs live, on average, according to their size and in relation to their weight.

[su_table responsive=”yes” alternate=”yes” fixed=”no” class=””]


<21 lbs
< 9.5 kg
Medium/Moyen/ Mediano
21 lbs – 49 lbs
9.6 kg – 22 kg

50 lbs – 88 lbs
23 kg – 40kg
1 15 15 15
2 24 24 24
3 28 28 28
4 32 32 32
5 36 36 36
6 40 42 45
7 44 47 50
8 48 51 55
9 52 56 61
10 56 60 66
11 60 65 72
12 64 69 77
13 68 74 82
14 72 78 88
15 76 83 93
16 80 87 120


Some exceptions to the rule are those known as the longest-living dogs.

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About cosmodoggyland (477 Articles)
Gaby is our Content Director and main Emma spoiler. She believes knowledge paves the path towards dreams, so she is always searching for cost- and time-effective ways to achieve learning goals. Passionate about new tools to acquire and convey knowledge, she used creative methods to make Science and Math fun for her children. With a B.Sc. and Marketing studies, she is currently involved in an educational online startup. Contact at cosmodoggyland@gmail.com

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